参数资料
| 型号： | LT1521IST-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .3A SOT223-3 |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 78 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 20V |
| 电压 - 压降（标准）： | 0.5V @ 300mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA |
| 电流 - 限制（最小）： | 320mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-261-4，TO-261AA |
| 供应商设备封装： | SOT-223 |
| 包装： | 管件 |
| 产品目录页面： | 1327 (CN2011-ZH PDF) |
LT1521/LT1521-3
LT1521-3.3/LT1521-5
300mA Low Dropout
Regulators with Micropower
Quiescent Current and Shutdown
FEATURES
DESCRIPTIO
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Dropout Voltage: 0.5V
Output Current: 300mA
Quiescent Current: 12 μ A
No Protection Diodes Needed
Adjustable Output from 3.8V to 20V
Fixed Output Voltages: 3V, 3.3V, 5V
Controlled Quiescent Current in Dropout
Shutdown I Q = 6 μ A
Reverse Battery Protection
The LT ? 1521/LT1521-3/LT1521-3.3/LT1521-5 are low
dropout regulators with micropower quiescent current
and shutdown. These devices are capable of supplying
300mA of output current with a dropout voltage of 0.5V.
Designed for use in battery-powered systems, the low
quiescent current, 12 μ A operating and 6 μ A in
shutdown, makes them an ideal choice. The quiescent
current is well controlled; it does not rise in dropout as it
does with many other low dropout PNP regulators.
No Reverse Current
Thermal Limiting
Low Current Regulator
Regulator for Battery-Powered Systems
Post Regulator for Switching Supplies
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APPLICATIO S
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Other features of the LT1521/LT1521-3/LT1521-3.3/
LT1521-5 include the ability to operate with very small
output capacitors. They are stable with only 1.5 μ F on the
output while most older devices require between 10 μ F and
100 μ F for stability. Small ceramic capacitors can be used,
enhancing manufacturability. Also, the input may be con-
nected to voltages lower than the output voltage, including
negative voltages, without reverse current flow from out-
put to input. This makes the LT1521 series ideal for backup
power situations where the output is held high and the
input is low or reversed. Under these conditions only 5 μ A
will flow from the output pin to ground.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V Battery-Powered Supply with Shutdown
Dropout Voltage
8
IN
OUT
1
5V
300mA
0.6
6V
1 μ F
5
SHDN
LT1521-5
SENSE
2
+
1.5 μ F
0.5
0.4
GND
3
0.3
0.2
V SHDN (PIN 5) OUTPUT
<0.25 OFF
>2.80 ON
0.1
NC ON
LT1521 ? TA01
0
0
50
100 150 200
250
300
OUTPUT CURRENT (mA)
LT1521 ? TA02
1521335fb
1
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相关代理商/技术参数 |
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